Koleroga or Mahali is a major disease of arecanut causing serious losses. The pathogen is a fungus Phytophthora palmivora. Spraying the. PDF | On Jan 1, , R Ramesh and others published Management of fruit rot ( Koleroga/ Mahali) disease of arecanut. Koleroga (kole = rotting, roga = disease) as it is called in Karnataka is in the same orchard (as found in Karnataka where arecanut, cocoa, cardamom, black.

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Phytophthora palmivora – Wikipedia

The fruit bunches infected towards the end of rainy season may remain mummified on the palm and such nuts provide inoculums for bud rot or crown rot or the recurrence of fruit rot in the next season, according to Dr. Please Email the Editor. Though the farmers did take up the first round of spraying in July, the disease could not be controlled, he said, adding that his own plantation was hit.

The areca fruits surfaces get rotten as a result of the disease.

Koleroga Disease of Areca Palms: Symptoms and Management | Plant Pathology

Comment Name required Email will not be published required Website Please enter an answer in digits: Infected fruit on the trees and those that have fallen to the ground should be removed to reduce the inoculum for aerial infection of fruit and stems, and infection of seedling roots in subsequent plantings.

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Chemical control methods for P. Muller[2] Phytophthora palmivora var. In water, chlamydospores germinate by producing joleroga germ tubes, each with a sporangium at the tip.

The disease leads to heavy shedding of fruits,”explains Kolerogaa.

Raviprasad Kamila Mangaluru, August 20, The leaves and bunches wither away soon. During the corresponding period last year, the district received 2, One common symptom of P.

Retrieved 15 November Control arecwnut As mechanical control measure, the areca bunches can be covered with polythene covers before the start of the heavy monsoon showers. Mature zoospores can be induced to germinate arecankt treatment with 0. For PC, position your mouse cursor on the featured image, click the right mouse button, and choose “Save Picture As The first appearance of the koleroga is on the nuts two or three weeks after rains begin.

The first symptoms are water-soaked lesions on the nut surface near the calyx.

‘Kole roga’ strikes arecanut plantations in Dakshina Kannada again

In coconuts, the expected yield losses caused by P. The infected fruits loose their natural green colour.

The green colour of the nut-shell turns darker green and the early symptoms gradually spread ultimately covering the entire surface of the nut. Although the common name of Phytophthora palmivora is bud rot of palms, it affects many tropical plants and has a moderately broad host range.

Its symptoms are invariably noticed as dark green water-soaked lesions near the perianth calyx. Saraswathy and Nambiar stated that the systemic fungicides such as Aliette and Ridomil at 0. Zoospores emerge out of the sporangia in the presence of abundant light and atmospheric humidity. Host resistance is also a method of controlling the pathogen, resistant plants generally have thicker cuticles which inhibits the ability of the pathogen to enter the host.

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The Hindu : Sci Tech / Agriculture : Managing fruit rot disease of areca nut

Coleman Orellana [2] Phytophthora parasitica var. Plant Disease Management Reports. According to the office of the Deputy Commissioner, the district recorded an average rainfall of 4, Root rots are another symptom of P. As the intensity of rains did not come down, many farmers were not able to spray the usual first round of prophylactic solutions in the last week of May or the first week of June to prevent the disease.

Common Names of Plant Diseases.

Chlamydospores formed in fallen fruit survive in soil and serve as the main source of inoculum for infection of roots of papaya seedling in subsequent plantings. Printable version Dec 31, 7: Companion crops are planted in the same fields as the host plant and are used to divert some of the arceanut away from the hosts, an example being planting bananas and avocados in the same field. As previously stated impacts of P.